When trying to create a symlink between folders that require root access, Dolphin would not ask for the root password before performing the operation - instead, it will simply fail due to lack of permissions.

Steps to reproduce:
* Open two folders in which the user doesn't have write permissions (e.g. /usr/lib/chromium-browser/ and /opt/google/chrome/).
* Drag and drop some file from one of the folders above to the other.
* When it asks what to do with it, select "Link here".

Expected behavior:
* Should ask for root password and create a link.

Actual behavior:
* Fails due to permissions